Shingles is caused by a reactivation of the virus Varicella
Herpes Zoster (VZV) that also causes chickenpox.
VZV is a very contagious virus. It spreads
via the humidity in the air in the incubation period of chickenpox
which lasts from 7 to 23 days and has no symptoms. After chickenpox,
VZV will stay in the body but remain latent.
This means that it is no longer contagious and will not cause
chickenpox again.